let s = 'hello'
let n = 123
let f = true
let b = null
let m = Symbol('123')
let o = {a:1}
let a = [1,2,3]
let d = new Date()
let f1 = function(){}
let map = new Map()
let set = new Set()

console.log(typeof s)
console.log(typeof n)
console.log(typeof f)
console.log(typeof b)
console.log(typeof m)
console.log(typeof o)
console.log(typeof a)
console.log(typeof d)
console.log(typeof f1)
console.log(typeof map)
console.log(typeof set)
